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[vsnet-alert 7639] PU CMa bright outburst!



PU CMa bright outburst!

Dear Colleagues,

   As reported by Rod Stubbings in [vsnet-outburst 5213], the short-period
(candidaite) SU UMa-type dwarf nova PU CMa is undergoing a bright outburst.
The present outburst may be a superoutburst!

  YYYYMMDD(UT)   mag  observer
  20030108.492  <149  (Rod Stubbings)
  20030109.491  <148  (Rod Stubbings)
  20030110.501  <148  (Rod Stubbings)
  20030111.505  <144  (Rod Stubbings)
  20030111.667  <138  (Hiroshi Itoh)
  20030112.499  <140  (Rod Stubbings)
  20030112.765  <152  (Andrew Pearce)
  20030115.488  <135  (Rod Stubbings)
  20030118.506  <129  (Rod Stubbings)
  20030119.481  <135  (Rod Stubbings)
  20030120.587  <150  (Andrew Pearce)
  20030122.494  <150  (Rod Stubbings)
  20030123.481   151  (Rod Stubbings)
  20030125.483  <148  (Rod Stubbings)
  20030126.560  <138  (Andrew Pearce)
  20030127.524  <150  (Rod Stubbings)
  20030128.473  <148  (Rod Stubbings)
  20030131.464  <148  (Rod Stubbings)
  20030208.458  <144  (Rod Stubbings)
  20030210.485  <140  (Rod Stubbings)
  20030211.517  <140  (Rod Stubbings)
  20030213.489   112  (Rod Stubbings)

[From Kato et al., MNRAS in press (astro-ph/0210674)]

===

   Up to now, three three long outbursts (likely superoutbursts) [JD 2451677
(2000 May), 2452056 (2001 June), 2452418 (2002 May)] were detected.

   Although definitive classification requires further time-resolved
photometry, we propose that PU CMa to be an excellent candidate for an
SU UMa-type dwarf nova.  This indication is also strengthened by the
recently reported orbital period of 0.05669(4) d (Thorstenesen and Fenton
2002).  This period is one of the shortest periods among the known SU UMa-type
dwarf novae (Thorstensen et al. 2002).  Most of the systems with similar
orbital periods show significant deviations (either related to WZ Sge-type
dwarf novae or ER UMa-type dwarf novae) from normal SU UMa-type
dwarf novae.  PU CMa, with its outburst properties strongly resembling
a normal SU UMa-type dwarf nova may be the first object filling the gap
between the extreme WZ Sge-type and ER UMa-type systems.

===

   Urgent time-series photometric observations are undoubtedly most needed!
The Kyoto team (obervser Ishioka-san) magaged to take time-series observation
last night, which will be soon analyzed.  Please turn your telescope to
this unusual and bright (11th mag) dwarf nova in outburst!

Regards,
Taichi Kato
VSNET Collaboration team


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